Electrode of lithium sulfur battery and preparation method thereof

A lithium-sulfur battery and electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of low sulfur utilization rate, low sulfur loading area density, short cycle life, etc., to improve discharge capacity and quality Great effect of improving cycle life

Inactive Publication Date: 2016-10-26
柔电(武汉)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide an electrode for a lithium-sulfur battery, which solves the problems of low sulfur utilization rate, low sulfur loading area density, and short cycle life in the positive electrode of the existing lithium-sulfur battery

Method used

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  • Electrode of lithium sulfur battery and preparation method thereof
  • Electrode of lithium sulfur battery and preparation method thereof

Examples

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example 1

[0044] The first layer of conductive hydroxyl or carboxy-based layer uses nanocellulose as a support material, carbon nanotubes as a conductive material, the mass ratio of nanocellulose and carbon nanotubes is 1:1, and isopropanol is used as a solvent, and it is used after uniform dispersion The method of vacuum filtration quickly forms a film, and the density of the first layer of conductive layer is 2mg / cm 2 The active material layer uses sulfur-carbon composite positive electrode powder, nanocellulose and carbon nanotubes, sulfur-carbon composite positive electrode powder is used as active matter particles, nanocellulose is used as a support material, and carbon nanotubes are used as a conductive carbon material. The mass ratio of the three is 80:10:10, use isopropanol as a dispersion solvent, and use vacuum filtration to form a film after uniform dispersion, and the layer density of the prepared middle layer active material is 5mg / cm 2 ; The last layer of conductive layer ...

example 2

[0046] The first layer of conductive hydroxyl or carboxyl layer uses aramid fiber and Ketjen black, aramid fiber is used as the support material, Ketjen black is used as the conductive material, the mass ratio of aramid fiber and Ketjen black is 1:1, and N-methylpyrrolidone is used As a solvent, after uniform dispersion, use vacuum filtration to quickly form a film, and prepare the first layer of conductive layer with a density of 1mg / cm 2 The active material layer uses sulfur-carbon composite positive electrode powder, aramid fiber and Ketjen black. The sulfur-carbon composite positive electrode powder is used as the active particle, aramid fiber is used as the support material, and Ketjen black is used as the conductive carbon material. The mass ratio of the three is 90: 5:5, use ethanol as the dispersion solvent, and use vacuum filtration to form a film after the dispersion is uniform, and the layer density of the prepared middle layer active material is 20mg / cm 2 ; The las...

example 3

[0048] The first conductive layer uses aramid fiber and conductive carbon black. The mass ratio of aramid fiber and conductive carbon black is 2:1. Deionized water is used as the dispersion solvent. After the dispersion is uniform, the vacuum filtration method is used to quickly form a film. Prepare the first layer of conductive layer with a density of 0.5mg / cm 2 ; The active material layer uses sulfur cathode powder, nanocellulose and carbon nanotubes, and the mass ratio of the three is 85:10:5. Deionized water is used as the dispersion solvent. After the dispersion is uniform, the vacuum filtration method is used to form a film. The prepared The layer density of active material in the middle layer is 10mg / cm 2 ;The last layer of conductive layer uses the same ratio and surface density as the first layer, uses deionized water as the dispersion solvent, and after the dispersion is uniform, the vacuum filtration method is used to form a film on the basis of the first two layers...

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Abstract

The invention discloses an electrode of a lithium sulfur battery and a preparation method thereof. The electrode of the lithium sulfur battery includes an active substance layer containing sulfur, and conductive hydroxyl or carboxyl layers are formed on the upper surface and the lower surface of the active substance layer respectively; the active substance layer and the conductive hydroxyl are combined, or the active substance layer and the conductive carboxyl layers are combined, through external pressure, a surface substance of the active substance layer generates cross-linking interaction and hydrogen bond interaction with a fiber component of the conductive hydroxyl or carboxyl layers. The hydroxyl or carboxyl layers have high specific surface area, can adsorb polysulfide and inhibit a back-and-forth shuttling effect. The three-layer electrode structure has higher porosity, can store more electrolyte liquids, is conducive to slow down dissolution of sulfur and polysulfide, thereby ensuring occurrence of positive electrode reactions and improving the discharge capacity of the battery. Increase of the electrolyte liquid viscosity due to dissolution of the sulfur and polysulfide is also effectively alleviated. The preparation method is simple, and is easy to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery electrode and a preparation method. Background technique [0002] In the lithium-sulfur battery system, metal lithium is used as the negative electrode and elemental sulfur is used as the positive electrode. The theoretical specific energy can reach 2600Wh / kg, which is much larger than modern commercial lithium-ion batteries. In addition, elemental sulfur also has the characteristics of low price and environmental friendliness. Therefore, lithium-sulfur batteries have high potential for commercial application. However, lithium-sulfur batteries also have many problems. The most important of these is that the utilization rate of sulfur is low during the charging and discharging process, and the capacity decays rapidly during the cycle. [0003] At the same time, sulfur is a typical electronic insulator with poor electrochemical activity;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 解明李贝于明鹏马俊胜
Owner 柔电(武汉)科技有限公司
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